Police cordoned off an area outside the city's Curve theatre this evening.
Three police cars and an ambulance were parked in Orton Square from about 5.30pm.
An area roughly 12 feet by 12 feet was cordoned off behind blue police tape.
A number of bright red blood spots could be seen within the cordon.
A teenager with a bandaged right hand walked with two police officers along the the public footpath which runs alongside the Serbian Orthodox Church of St George, between St George Street and Orton Square.
The injured teenager went inside the ambulance which remained at the scene.
A police officer at the scene said they were trying to establish what had happened.
